<!DOCTYPE>
<html>
<head>
  <meta charset="utf-8" />
  <title>外部样式表</title>
  <!--链接式:推荐使用-->
  <link rel="stylesheet" type="text/css" href="css/style.css" />
  <!--导入式-->
  <style type="text/css">
    @import url("css/style.css");
  </style>
</head>
<body>
     <ol>
         <li>1111</li>
         <li>2222</li>
     </ol>
</html>